The only difference between them "on average" is the isotopes of oxygen involved. Variations involving bond switching, or thermal oscillation / rotation will be removed upon averaging.
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It has a different amount of space between molecules.
adhesion
The molecules in a solid vibrate in place. The molecules of a liquid are moving about.
Cohesion is the attraction between molecules of the same substance, while adhesion is the attraction between molecules of different substances.
It has a different amount of space between molecules
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In these molecules the difference of the electronegativity between the two atoms is significant.
Achiral molecules are symmetrical and do not have a handedness, while chiral molecules are asymmetrical and have a distinct handedness.
During the phase change from a liquid to a gas, the average distance between molecules always increases.
The average distance between oxygen molecules at Standard Temperature and Pressure (STP) is approximately 3.3 nanometers.
Koko the gorilla was estimated to have an IQ between 70 and 95, which is lower than the average human IQ of 100.